I will support your petition. I will probably manage to sign with several accounts, too .The green dA background has some kind of fairness it a way. I looks ugly with every color, and does damage everything impartially. Lovely image anyway

deviantART is listening more than ever before to the suggestions of its members (which apparently doesn't always lead to useful improvement). There's a weekly newsletter posted in #hq with site updates and stuff, and at the end of each newsletter they're asking for suggestions. It would be a good start to ask for the ability to change the background colour on deviation pages in the comments below this newsletter. Especially if enough people are asking for it.